The Cup 2 Rs make a huge difference to the performance ... Likewise if you go all out and pick yourself up a 991 GT3. BMW has launched a limited-run M4 CS to celebrate Valentino Rossi's birthday ...

The result is a car that looks more Porsche 911 GT3 RS than M2. It even makes BMW’s own M4 GTS look a touch subdued. In fact, it's so quick that AC Schnitzer has just set the fastest ever lap by ...